2WBQ image
Entry Detail
PDB ID:
2WBQ
Keywords:
Title:
Crystal structure of VioC in complex with (2S,3S)-hydroxyarginine
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2009-03-02
Release Date:
2009-06-23
Method Details:
Experimental Method:
Resolution:
1.10 Å
R-Value Free:
0.17
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:L-ARGININE BETA-HYDROXYLASE
Chain IDs:A
Chain Length:358
Number of Molecules:1
Biological Source:STREPTOMYCES VINACEUS
Primary Citation
Structural Basis for the Erythro-Stereospecificity of the L-Arginine Oxygenase Vioc in Viomycin Biosynthesis.
FEBS J. 276 3669 ? (2009)
PMID: 19490124 DOI: 10.1111/J.1742-4658.2009.07085.X

Abstact

The nonheme iron oxygenase VioC from Streptomyces vinaceus catalyzes Fe(II)-dependent and alpha-ketoglutarate-dependent Cbeta-hydroxylation of L-arginine during the biosynthesis of the tuberactinomycin antibiotic viomycin. Crystal structures of VioC were determined in complexes with the cofactor Fe(II), the substrate L-arginine, the product (2S,3S)-hydroxyarginine and the coproduct succinate at 1.1-1.3 A resolution. The overall structure reveals a beta-helix core fold with two additional helical subdomains that are common to nonheme iron oxygenases of the clavaminic acid synthase-like superfamily. In contrast to other clavaminic acid synthase-like oxygenases, which catalyze the formation of threo diastereomers, VioC produces the erythro diastereomer of Cbeta-hydroxylated L-arginine. This unexpected stereospecificity is caused by conformational control of the bound substrate, which enforces a gauche(-) conformer for chi(1) instead of the trans conformers observed for the asparagine oxygenase AsnO and other members of the clavaminic acid synthase-like superfamily. Additionally, the substrate specificity of VioC was investigated. The side chain of the L-arginine substrate projects outwards from the active site by undergoing interactions mainly with the C-terminal helical subdomain. Accordingly, VioC exerts broadened substrate specificity by accepting the analogs L-homoarginine and L-canavanine for Cbeta-hydroxylation.

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